arch/mips/lasat/prom.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * PROM interface routines.
   4  */
   5 #include <linux/types.h>
   6 #include <linux/init.h>
   7 #include <linux/string.h>
   8 #include <linux/ctype.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11 #include <linux/bootmem.h>
  12 #include <linux/ioport.h>
  13 #include <asm/bootinfo.h>
  14 #include <asm/lasat/lasat.h>
  15 #include <asm/cpu.h>
  16
  17 #include "at93c.h"
  18 #include <asm/lasat/eeprom.h>
  19 #include "prom.h"
  20
  21 #define RESET_VECTOR    0xbfc00000
  22 #define PROM_JUMP_TABLE_ENTRY(n) (*((u32 *)(RESET_VECTOR + 0x20) + n))
  23 #define PROM_DISPLAY_ADDR       PROM_JUMP_TABLE_ENTRY(0)
  24 #define PROM_PUTC_ADDR          PROM_JUMP_TABLE_ENTRY(1)
  25 #define PROM_MONITOR_ADDR       PROM_JUMP_TABLE_ENTRY(2)
  26
  27 static void null_prom_display(const char *string, int pos, int clear)
  28 {
  29 }
  30
  31 static void null_prom_monitor(void)
  32 {
  33 }
  34
  35 static void null_prom_putc(char c)
  36 {
  37 }
  38
  39 /* these are functions provided by the bootloader */
  40 static void (*__prom_putc)(char c) = null_prom_putc;
  41
  42 void prom_putchar(char c)
  43 {
  44         __prom_putc(c);
  45 }
  46
  47 void (*prom_display)(const char *string, int pos, int clear) =
  48                 null_prom_display;
  49 void (*prom_monitor)(void) = null_prom_monitor;
  50
  51 unsigned int lasat_ndelay_divider;
  52
  53 static void setup_prom_vectors(void)
  54 {
  55         u32 version = *(u32 *)(RESET_VECTOR + 0x90);
  56
  57         if (version >= 307) {
  58                 prom_display = (void *)PROM_DISPLAY_ADDR;
  59                 __prom_putc = (void *)PROM_PUTC_ADDR;
  60                 prom_monitor = (void *)PROM_MONITOR_ADDR;
  61         }
  62         printk(KERN_DEBUG "prom vectors set up\n");
  63 }
  64
  65 static struct at93c_defs at93c_defs[N_MACHTYPES] = {
  66         {
  67                 .reg            = (void *)AT93C_REG_100,
  68                 .rdata_reg      = (void *)AT93C_RDATA_REG_100,
  69                 .rdata_shift    = AT93C_RDATA_SHIFT_100,
  70                 .wdata_shift    = AT93C_WDATA_SHIFT_100,
  71                 .cs             = AT93C_CS_M_100,
  72                 .clk            = AT93C_CLK_M_100
  73         }, {
  74                 .reg            = (void *)AT93C_REG_200,
  75                 .rdata_reg      = (void *)AT93C_RDATA_REG_200,
  76                 .rdata_shift    = AT93C_RDATA_SHIFT_200,
  77                 .wdata_shift    = AT93C_WDATA_SHIFT_200,
  78                 .cs             = AT93C_CS_M_200,
  79                 .clk            = AT93C_CLK_M_200
  80         },
  81 };
  82
  83 void __init prom_init(void)
  84 {
  85         int argc = fw_arg0;
  86         char **argv = (char **) fw_arg1;
  87
  88         setup_prom_vectors();
  89
  90         if (IS_LASAT_200()) {
  91                 printk(KERN_INFO "LASAT 200 board\n");
  92                 lasat_ndelay_divider = LASAT_200_DIVIDER;
  93                 at93c = &at93c_defs[1];
  94         } else {
  95                 printk(KERN_INFO "LASAT 100 board\n");
  96                 lasat_ndelay_divider = LASAT_100_DIVIDER;
  97                 at93c = &at93c_defs[0];
  98         }
  99
 100         lasat_init_board_info();                /* Read info from EEPROM */
 101
 102         /* Get the command line */
 103         if (argc > 0) {
 104                 strncpy(arcs_cmdline, argv[0], COMMAND_LINE_SIZE-1);
 105                 arcs_cmdline[COMMAND_LINE_SIZE-1] = '\0';
 106         }
 107
 108         /* Set the I/O base address */
 109         set_io_port_base(KSEG1);
 110
 111         /* Set memory regions */
 112         ioport_resource.start = 0;
 113         ioport_resource.end = 0xffffffff;       /* Wrong, fixme.  */
 114
 115         add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
 116 }
 117
 118 void __init prom_free_prom_memory(void)
 119 {
 120 }
 121
 122 const char *get_system_type(void)
 123 {
 124         return lasat_board_info.li_bmstr;
 125 }